Drop real template library; keep CDN-only matching.

Remove build_library and runtime artifacts, ignore regenerable outputs, and add README/AGENTS/DESIGN/CHANGELOG for the simplified project.

Co-authored-by: Cursor <cursoragent@cursor.com>

evaluate.py

@@ -4,13 +4,11 @@ Labels live in samples/labels.json as {frame filename: 10 hero keys}, '?' for
 slots nobody has identified yet. Those slots are skipped, not counted wrong.
 
 Usage:
-    python evaluate.py                # use the full template library
-    python evaluate.py --cdn-only     # ignore templates/real, measure the fallback layer
+    python evaluate.py
 """
 
 import json
 import sys
-from pathlib import Path
 
 import cv2
 
@@ -22,7 +20,6 @@ RAW_DIR = ROOT / "samples" / "raw"
 
 
 def main() -> None:
-    cdn_only = "--cdn-only" in sys.argv
     if not LABELS_PATH.is_file():
         sys.exit(f"missing {LABELS_PATH}")
     frames = json.loads(LABELS_PATH.read_text(encoding="utf-8"))["frames"]
@@ -31,9 +28,7 @@ def main() -> None:
     if not cfg["slots"]:
         sys.exit("config.json has no slots - run autocalibrate.py first")
     library = load_template_library()
-    if cdn_only:
-        library = [t for t in library if t[1] == "cdn"]
-    print(f"library: {len(library)} templates{' (cdn only)' if cdn_only else ''}")
+    print(f"library: {len(library)} CDN templates")
 
     graded = correct = skipped = 0
     misses: list[str] = []